| 6.5wt% Silicon steel is the ideal material to improve efficiency, save energy and lighten electromagnetic equipment for its advanced characteristics in little iron loss under high frequency, small magnetostriction and low noise under magnetic environment. In the preparation of 6.5wt%Si, only Chemical Vapor Deposition (CVD) method has been industrially realized. After a rich Fe3Si layer is generated on the surface of normal silicon steel sheet by CVD method, the silicon can diffuse into the steel to get the specific silicon content and distribution under high temperature condition. This paper discussed the nozzle spraying method to produce 6.5wt% Silicon steel by continuous CVD method, and the gas supply mode was studied by numerical simulation and experiment tests. Based on these results, different influence factors on deposition rate were investigated in detail.Firstly, compared with homogeneous gas method, it was found that nozzle spraying method is more suitable in the production of 6.5wt% Silicon steel by continuous CVD method for industrial production. Secondly, flow fields under different gas supply mode were simulated by Fluent software. The numerical result were verified by the thermal wind speed meter under the same boundary conditions. According to the study, it was found that when the injection angle is 0 degree, better uniformity and infiltration rate can be achieved than other jet angles. It was proved that vertical jet by nozzle spraying method to steel is the optimal way to create 6.5wt% Silicon steel. Thirdly, under different temperatures, concentrations of reactants and gas flows, a series of experiments on silicon infiltration by nozzle spraying method were conducted to reveal the influential factors on the silicon infiltration rate. Finally, according to the numerical and experimental data, we analyzed the morphology and magnetic of high silicon steel which will lay the foundation for industrial mass production of 6.5wt% silicon steel in future. |
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